<h3 mat-dialog-title>长按保存/分享</h3>
<mat-dialog-content>

    <img style="width: 100%;" [src]="data.srcData">

</mat-dialog-content>
<mat-dialog-actions>
    <button mat-button mat-dialog-close type="button"></button>
    <span class="fill-remaining-space"></span>
    <button mat-raised-button color="primary" mat-dialog-close type="button">关闭</button>
</mat-dialog-actions>